Access Point #: MAFS.912.N-RN.2.AP.3b (Archived Access Point)


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Know and justify that when adding a rational number and an irrational number the result is irrational.

Clarifications:

Essential Understandings

Concrete:

  • Recognize rational numbers (numbers you can write as a fraction).
  • Recognize irrational numbers (approximations like square root of 2, or pi).
  • Identify the patterns in adding irrational numbers by rational numbers.
Representation:
  • Understand rational number – any number you can write as a fraction.
  • Understand irrational number – non-repeating, non-terminating decimal number (various square roots, pi).
  • The sum of a rational number and an irrational number is an irrational number begin mathsize 12px style open parentheses e. g. comma space 2 space plus space square root of 3 space equals space 2 space plus space square root of 3 semicolon space 8 space plus space 2 straight pi space equals space 8 space plus space 2 straight pi close parentheses end style.

Number: MAFS.912.N-RN.2.AP.3b Category: Access Points
Date Adopted or Revised: 07/14 Cluster: Use properties of rational and irrational numbers. (Algebra 1 - Additional Cluster)

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Related Standards

Name Description
MAFS.912.N-RN.2.3: Explain why the sum or product of two rational numbers is rational; that the sum of a rational number and an irrational number is irrational; and that the product of a nonzero rational number and an irrational number is irrational.



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